package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;

public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }


    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //获取请求头token
        String token = request.getHeader("authorization");
        if (token == null) {
            return true;
        }

        //判断用户是否存在
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(LOGIN_USER_KEY + token);

        if (userMap.isEmpty()) {
            return true;
        }

        //进行token续期
        stringRedisTemplate.expire(LOGIN_USER_KEY + token, RedisConstants.LOGIN_USER_TTL, TimeUnit.SECONDS);


        //把用户信息存储到ThreadLocal中
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        UserHolder.saveUser(userDTO);

        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

        //销毁用户信息
        UserHolder.removeUser();

        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
